We have assembled the gazebo and are very happy with the end result.  (somewhat difficult getting there and your recommendation of having 3 people to assemble is accurate- we did it with 2 but was very difficult)   We feel that the quality and strength is very good.  It has been tested in the rain and it does not leak.
The shipping was another story as it had to be reordered and the whole process took 43 days.  We do not believe this timeframe was a fault of Wayfair but more of a shipping problem.  As we tracked our order it (as well as the replacement)  was shipped when Wayfair promised it.  Now just looking forward to spending the summer days using it!    Thanks.